[mythtv] SVN 7245 thinks WB HDTV is encrypted?

Kenneth Aafl°y lists at kenneth.aafloy.net
Wed Sep 14 13:50:02 UTC 2005


Onsdag 14 september 2005 15:20, skrev Daniel Kristjansson:
> On Wed, 2005-09-14 at 14:59 +0200, Kenneth Aafl°y wrote:
> > Onsdag 14 september 2005 03:58, skrev Daniel Kristjansson:
> > "CA_system_ID -- This is an 16 bit field indicating the type of CA system
> > applicable for either the associated ECM and/or EMM streams. The coding
> > of this is privately defined and is not specified by ITU -T | ISO/IEC."
>
> Arg! So this is a hole in the standard...
>
> I found a ATSC standard A/70a http://www.atsc.org/standards/a70a.html
> No working link to it on the ATSC page.. (security thought obscrurity ;)
> Anyway, it offers no help on the System ID, but it does specify that
> the CA descriptor is only required in the PMT and CAT for ATSC.
>
> > Is either "PES packet payload" or transport_scrambling_control set to
> > anything other than 0 in those streams?
>
> The idea was to be able to do this from the tables without looking at
> the actual streams..
>
> > It could be that they are getting ready for ppv.
>
> It is illegal for these broadcasters to encrypt main stream.
> It looks more like a misconfiguration at the transmitter.

Ah, ok.

Looks like ca_system_id = 0 is reserved on DVB anyways, see ETR 162.
Another document you should have a look at is ETR 289.

These documents is available @ etsi.org, which only requires you
to register for free access.

Kenneth


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